This project involves the conversion of methanol to hydrocarbons over a zeolite catalyst. The proposed beamtime will examine systematically a series of catalyst samples prepared in the Glasgow University/ISIS catalytic reactor which has been upgraded to allow long term catalyst testing under industrially realistic conditions with full on-line analysis of the reaction products. We wish in particular to distinguish between the hydrocarbon species present in the zeolite catalyst under two different reaction regimes: low temperature (300-350 C) where major products are alkanes and aromatics, and high temperature (> 400 C) where olefin products dominate and catalyst lifetime is extended. The low frequency vibrational spectra from TOSCA will complement infrared and other characterisation measurements (NMR, TPO, EPR) on the same suite of samples.